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. 2020 Jan 20;74(2):349–364. doi: 10.1111/evo.13922

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© 2020 The Authors. Evolution published by Wiley Periodicals, Inc. on behalf of The Society for the Study of Evolution

This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Electroantennographic responses of Heliconius butterflies to synthetic wing compounds. Stimuli: air (white), dichloromethane plus 2‐tetradecyl acetate (internal standard) (dark gray), hexane (light gray), Lantana extract (green), natural male H. melpomene or H. cydno wing extract (red or dark blue, respectively), synthetic H. melpomene or H. cydno blend (pink or blue, respectively). P1 (Syr), syringaldehyde; P2 (18O), octadecanal; P3 (18OH), 1‐octadecanol; P4 (C21), henicosane; P5 (20O), (Z)‐11‐icosenal; P6 (20OH), (Z)‐11‐icosenol; P7 (22O), (Z)‐13‐docosenal. Bars: average of normalized corrected amplitude ± standard deviation. Light pink, compound part of synthetic H. melpomene blend; light blue, compound part of synthetic H. cydno blend; purple, compound in both H. melpomene and H. cydno synthetic blends.